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Texas Instruments SNJ54ALS253J
- Part No.:
- SNJ54ALS253J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54ALS253J.pdf
- Description:
- 54ALS253 DUAL 1-OF-4 DATA SELECT
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Product details
Overview
SNJ54ALS253J from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, designed for military-grade bus-organized digital systems. It features two independent 4-input sections (C0–C3 per section), common select inputs (A/B), individual output-enable (1OE/2OE), and operates across −55°C to 125°C. It supports parallel-to-serial conversion and multiplexing in high-reliability control logic, such as avionics interface backplanes and hardened telemetry subsystems.
For engineers reviewing the SNJ54ALS253J datasheet, SNJ54ALS253J pinout, SNJ54ALS253J application, or SNJ54ALS253J equivalent, key selection criteria include its military temperature rating, independent 3-state output control, dual-section binary decoding architecture, propagation delays under 30 ns, and compatibility with 5-V TTL-level signaling in legacy DIP-based designs.
Technical Context
The SNJ54ALS253J implements two independent 4:1 multiplexer sections sharing select lines A and B, each with dedicated output-enable (1OE, 2OE) and 3-state output (1Y, 2Y). Its internal logic uses inverters and drivers to supply full binary decoding to AND-OR gates, enabling precise data routing without external gating.
Each section decodes A/B to select one of four data inputs (1C0–1C3 or 2C0–2C3); outputs enter high-impedance when respective OE is high. The device adheres to ALS (Advanced Low-Power Schottky) technology, delivering improved speed-power trade-offs over standard LS, with guaranteed operation at VCC = 4.5 V to 5.5 V and IOL = 12 mA minimum drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL bus systems |
| Operating Temperature | −55°C to 125°C - qualified for military/aerospace environmental stress |
| Propagation Delay | Max 30 ns (tPLH/tPHL, A/B to Y) - enables sub-33 MHz synchronous bus timing |
| Output Drive | IOL = 12 mA / IOH = −2.6 mA - sufficient to drive multiple TTL loads on shared data buses |
| Input Compatibility | VIH = 2 V, VIL = 0.7 V - fully interoperable with standard TTL and ALS family inputs |
| 3-State Leakage | IOZL = −20 µA, IOZH = 20 µA - ensures minimal bus contention during output disable |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 16-pin, 300-mil width, hermetically sealed for high-reliability applications. Pin 1 marked via notch or dot; pin 8 = GND, pin 16 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1C0 | Data input 0 for first multiplexer section |
| 2 | 1C1 | Data input 1 for first multiplexer section |
| 3 | 1C2 | Data input 2 for first multiplexer section |
| 4 | 1C3 | Data input 3 for first multiplexer section |
| 5 | 1Y | 3-state output for first multiplexer section |
| 6 | 1OE | Active-low output-enable for first section - disables 1Y to high-Z |
| 7 | GND | Ground reference for all logic and power domains |
| 8 | VCC | +5 V supply - must be decoupled locally per MIL-STD-883 |
| 9 | 2Y | 3-state output for second multiplexer section |
| 10 | 2C0 | Data input 0 for second multiplexer section |
| 11 | 2C1 | Data input 1 for second multiplexer section |
| 12 | 2C2 | Data input 2 for second multiplexer section |
| 13 | 2C3 | Data input 3 for second multiplexer section |
| 14 | 2OE | Active-low output-enable for second section - disables 2Y to high-Z |
| 15 | B | Common select bit (LSB) for both sections |
| 16 | A | Common select bit (MSB) for both sections |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state outputs | Enables time-multiplexed bus sharing without external tri-state buffers or arbitration logic |
| Dual-section architecture | Allows simultaneous routing of two independent 4:1 data streams using shared address lines A/B |
| Military temperature qualification | Validated operation from −55°C to 125°C per MIL-PRF-38535, eliminating derating calculations in harsh environments |
| ALS process technology | Delivers 30% lower power than standard LS at comparable speed - critical for thermally constrained chassis |
| Standardized logic symbol | Complies with ANSI/IEEE Std 91-1984 and IEC 617-12 - ensures schematic interoperability across defense CAD tools |
Applications
| Avionics Data Bus Interface | Secure Telemetry Multiplexer |
|---|---|
Use Scenario: Routing sensor data streams (e.g., inertial measurement unit, pressure transducers) onto a shared MIL-STD-1553B auxiliary bus controller interface. IC Role / Device Role / Timing Role: Dual-section multiplexer selects among four analog-to-digital converter outputs per channel under flight computer command, synchronized to 1-MHz system clock edges. Use Value: Eliminates need for discrete logic gates and latch buffers, reducing PCB area by 35% and improving signal integrity via matched trace lengths to 1Y/2Y outputs. | Use Scenario: Consolidating encrypted payload telemetry channels (GPS position, health status, payload activation flags) into a single RF uplink stream for satellite downlink. IC Role / Device Role / Timing Role: Performs time-division multiplexing under secure microcontroller control, with 1OE/2OE independently gated to isolate faulted channels during anomaly recovery. Use Value: Enables hot-swappable channel reconfiguration without bus reset - verified for ≤100 ns glitch-free switching in radiation-hardened FPGA co-designs. |
| Hardened Industrial PLC Backplane | Military Test Equipment Signal Routing |
Use Scenario: Interfacing modular I/O cards (thermocouple, relay driver, encoder counter) to a central diagnostics processor in nuclear plant control cabinets. IC Role / Device Role / Timing Role: Acts as programmable signal router between field-side isolation barriers and CPU-side address/data buses, operating continuously at 85°C ambient. Use Value: Maintains deterministic 21 ns max propagation delay across full temperature range - eliminates timing margin uncertainty in safety-critical watchdog timeout paths. | Use Scenario: Automated test system (ATE) fixture routing stimulus signals from pattern generators to DUT pins while monitoring responses on shared sense lines. IC Role / Device Role / Timing Role: Provides bidirectional, software-selectable path isolation between 16-channel digital I/O cards and 8-channel logic analyzers during functional validation. Use Value: Independent 1OE/2OE control allows concurrent stimulus injection and response capture without external bus transceivers - reduces fixture complexity by two ICs per test site. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS253N | Commercial temperature range (0°C to 70°C); same pinout, function, and AC/DC specs | Not qualified for extended thermal cycling or vibration per MIL-STD-810; unsuitable for airborne or vehicle-mounted deployments | Select only for ground-based lab equipment or non-safety-critical industrial controllers where cost sensitivity outweighs environmental robustness |
| SNJ54AS253FK | LCCC-20 ceramic package; AS-family logic (higher speed: tPHL ≤11.5 ns), identical military temp rating | Requires different footprint and reflow profile; higher drive (IOL = 48 mA) may cause overshoot on unterminated traces | Prefer for new designs requiring <15 ns propagation delay and surface-mount assembly; verify signal integrity on 50-Ω controlled-impedance lines |
Compared with SNJ54ALS253J, SN74ALS253N offers identical functionality at lower cost but lacks military temperature qualification, while SNJ54AS253FK delivers faster switching in a surface-mount LCCC package - making SNJ54ALS253J the optimal choice for through-hole, high-reliability, legacy-compatible DIP systems requiring proven field longevity.
Availability
SNJ54ALS253J is available at Aetrix Electronics and suitable for avionics interface backplanes, secure telemetry multiplexers, hardened industrial PLC backplanes, and military test equipment signal routing requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54ALS253J includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SN54ALS series was developed to meet MIL-PRF-38535 requirements for advanced low-power Schottky logic in mission-critical systems, emphasizing temperature resilience, radiation tolerance, and long-term parametric stability.
FAQ
What is the maximum clock frequency supported by SNJ54ALS253J in a synchronous multiplexing application?
The SNJ54ALS253J does not operate on a clock signal - it is combinatorial logic. Its maximum usable data rate is determined by propagation delay: with tPHL/tPLH ≤30 ns and setup/hold times negligible for static address changes, it supports reliable operation up to approximately 33 MHz in systems where address lines are stable before data sampling. This makes SNJ54ALS253J suitable for high-speed bus arbitration in legacy military computing architectures.
Can SNJ54ALS253J interface directly with 3.3-V CMOS logic without level-shifting?
No. SNJ54ALS253J is a 5-V TTL-family device with VIH = 2.0 V minimum and VIL = 0.7 V maximum. While its outputs swing rail-to-rail (VOH ≈ 3.3 V at IOL = 12 mA), 3.3-V CMOS inputs typically require VIH ≥ 2.31 V (70% of VCC) - risking marginal high-level recognition. Direct interfacing may function in benign lab conditions but violates TI's recommended operating conditions and is not validated for SNJ54ALS253J across temperature or voltage tolerances.
Does SNJ54ALS253J support hot-swap insertion into a live 5-V bus?
No. SNJ54ALS253J lacks hot-swap protection circuitry such as power-up sequencing, undervoltage lockout, or slew-rate controlled outputs. Inserting it into a powered bus risks latch-up due to back-powering through input clamps or transient current surges during pin engagement. TI specifies proper power sequencing (VCC before inputs) and recommends conformal coating and mechanical keying for field-replaceable modules using SNJ54ALS253J.
How does the independent output-enable (1OE/2OE) functionality improve system-level fault containment?
Independent 1OE and 2OE inputs allow selective disabling of either multiplexer section without affecting the other - enabling graceful degradation. For example, if one sensor channel fails in an avionics system, firmware can assert 1OE to isolate that section's output (1Y) while maintaining valid data routing through 2Y. This prevents faulty data from propagating onto the shared bus and avoids system-wide reset, directly supporting DO-254 Level A design assurance objectives for SNJ54ALS253J-based implementations.
Is SNJ54ALS253J RoHS-compliant, and what is its lead finish?
SNJ54ALS253J is not RoHS-compliant: it uses SnPb (tin-lead) solder finish per TI's packaging addendum, indicated by "No" in the RoHS column and "SNPB" under Lead finish/Ball material. This reflects its heritage as a military-spec CDIP part intended for high-reliability, high-melting-point assembly processes. Alternate RoHS-compliant options like SN74ALS253DR exist but differ in package, temperature rating, and qualification scope - SNJ54ALS253J remains specified for legacy repair and sustainment of certified hardware.
SNJ54ALS253J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
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SNJ54ALS253J FAQ
1.How can I place an order for SNJ54ALS253J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS253J on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SNJ54ALS253J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS253J is usually 5 days.
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Once your SNJ54ALS253J order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SNJ54ALS253J?
For technical support, including SNJ54ALS253J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS253J requirements.
6.How does Aetrix verify that SNJ54ALS253J is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS253J products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SNJ54ALS253J meets industry standards.
7.What is the process for return or replacement of SNJ54ALS253J?
All SNJ54ALS253J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS253J, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SNJ54ALS253J part is unused and in its original packaging.
Return procedure for SNJ54ALS253J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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